#include <iostream>
#include <string>
#include <cstring>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>


//以命令行参数的形式获取IP和端口号
int main(int argc, char *argv[])
{
    if (argc != 3)
    {
        std::cerr << "Usage: " << argv[0] << " server_ip server_port" << std::endl;
        return 1;
    }
    std::string server_ip = argv[1];//IP
    uint16_t server_port = std::stoi(argv[2]);//端口号

    // 1. 创建socket
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if(sockfd < 0)
    {
        std::cerr << "socket error" << std::endl;
        return 2;
    }
     // 填写服务器信息
     struct sockaddr_in server;
     memset(&server, 0, sizeof(server));
     server.sin_family = AF_INET;
     server.sin_port = htons(server_port);
     server.sin_addr.s_addr = inet_addr(server_ip.c_str());
     while(true)
     {
         std::string input;
         std::cout << "Please Enter# ";
         std::getline(std::cin, input);
        //发送消息
         int n = sendto(sockfd, input.c_str(), input.size(), 0, (struct sockaddr*)&server, sizeof(server));
         (void)n;
 
         char buffer[1024];
         struct sockaddr_in peer;
         socklen_t len = sizeof(peer);
         //接受消息
         int m = recvfrom(sockfd, buffer, sizeof(buffer)-1, 0, (struct sockaddr*)&peer, &len);
         if(m > 0)
         {
             buffer[m] = 0;
             std::cout << buffer << std::endl;
         }
     }

    return 0;
}